Eagle, my SOP for when an active torpedo has acquired me is very similar to what you have mentioned here except with the addition of rudder.
I try to position the torpedo at my 4 or 8 o'clock and ring up ahead standard. When the active interval begins to drop indicating homing I lay on flank, beginning, to quote PeriscopeDepth's signature, "executing the well-known maneuver of getting the hell out"
Once up to speed I wait until the interval is at 1. Drop active countermeasures (deep), blow ballast, and apply hard rudder. You corkscrew all the way to the top at breakneck speed, moving out of the sensor cone in case the torpedo follows you into the climb. This has yet to fail me unless I have no CMs loaded, there are multiple torpedos, or there was insufficient warning (e.g. air-dropped).
